package com.winexpress.account;

import com.winexpress.util.SessionAttributes;
import facebook4j.Facebook;
import facebook4j.FacebookFactory;
import facebook4j.conf.ConfigurationBuilder;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "FacebookSignin", urlPatterns = {"/facebookSignin"})
public class FacebookSignin extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            ConfigurationBuilder cb = new ConfigurationBuilder();
            cb.setDebugEnabled(true)
                    .setOAuthAppId("1551867595039278")
                    .setOAuthAppSecret("33eb1e60c63dd521f484592bf9da3017")
                    .setOAuthAccessToken("6dd584b0b2b717dcb587001b170e2f74")
                    .setOAuthPermissions("email,publish_stream");
            FacebookFactory ff = new FacebookFactory(cb.build());
            Facebook facebook = ff.getInstance();
            request.getSession().setAttribute(SessionAttributes.FACEBOOK, facebook);
            StringBuffer callbackURL = request.getRequestURL();
            int index = callbackURL.lastIndexOf("/");
            callbackURL.replace(index, callbackURL.length(), "").append("/facebookCallBack");
            response.sendRedirect(facebook.getOAuthAuthorizationURL(callbackURL.toString()));
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
